Unanswered: select Field add options

Hey,

I have a form where inside is a select Field. I want to add options to this field. I found in the documentation only a setOptions function is there also a function like addOptions or do I have to use a store and save there the different options? My code in the controller looks so:

As to see i get the selectField and named it agent. After that i make a server call which send me arrays back. I want to add data from the array in the select field. Did i really need to save the array in a store to add the options to the selectField?